Grate



. 1,700,368 A. FRANKENHEIM GPATE Filfid March 19, 1925 g INVENTQB fl BY 1 ATTORNEY Jan. 29, 1929.

Patented Jan. 29, 1929.

PATENT OFFICE.

AARON FRANKENHEIM, F JERSEY CITY, NEW JERSEY.

GRATE.

Application filed March 19, 1925. Serial No. 16,603.

This invention relates to grates, or gratebars comprising the same, and its principal object is to provide a grate with improved and eiiicient means for burning the smallest sizes of coal, such as screenings, barley, rice,

and buckwheat sizes of coal.

Other objects and advantages will hereinafter appear.

In the accompanying drawings,

Fig. 1 shows a perspective view of a portion of the grate-bar.

Fig. 2 shows a longitudinal sectional elevation of a portion of the grate-bar, taken on the line 22 of Fig. 1.

1s The grate proper preferably consists of a plurality of cast grate-bars 1, provided with suitable frames 2, longitudinally extending strengthening or reinforcing rib 8, and pivot ing journals 4C for rocking or shaking the re grate. Each grate-bar is provided with a series of transverse ribs 5, which support'the coal, and each rib tapers downwardly in the manner shown. The ribs 5 are separated by spaces 6 of a width approximating in dimen 3T sion the thickness of the ribs, and within each space 6 is located a rib 7 which tapers up wardly in the manner shown, so that the top surface 8 of each rib is near to but under the top level 9 of the ribs 5, and between each side 10 of each rib 7 and its adjoining rib 5 there is an inclined air passage-way 11,- as indicated, with the walls of each passageway tapering upwardly. The ribs 5, 7 are preferably joined by reinforcing ribs 2, as shown in Fig. 1. The top surfaces 8 of the rib 7 and the portions of the walls 10 adjacent to said surfaces serve to support the coal at the wide spaces 6, and in the operation of this grate, the air enters through the bottom of the inclined passageways 11 at each rib 7 flows upwardly and is thereby directed into the part of the coal supported by the ribs 7 and the air thus forming two currents merges in the space 12 above the top surface 8, whereat it combined power of the two currents, through is admixed and is forced upwardly, due to the the coal mass with increased force, and these inclinations furthermore serve to permit the ashes to pass out more readily upon the sha king of the grate. It will be evident that the width of the channels 11 and the height of the spaces 12 may be proportioned to the tinepess and other qualities of the coal to be user.

Variations may be resorted to within the scopeof the invention.

Having thus described my invention, I claim 1. A grate bar having a series of ribs for supporting the fuel, said ribs tapering down- 7 wardly, a rib between each adjoining pair of said first ribs, said second ribs tapering upwardly and having their tops located below the top level of said first ribs, and said second gibs serving as an additional support for the uel.

2. A grate bar having a series of ribs for supporting the fuel, said ribs tapering downwardly, a rib between each adjoining pair of said first ribs, said second ribs tapering upso wardly and having their tops located below the top level of said first ribs, said second ribs serving as an additional support for the fuel, said ribs forming an inclined air passageway at each side of each ofsaid second ribs, 85 and said passage-ways merging with each other above the tops of said second ribs.

Signed at New York, in the county of New York, and State of New York, this 18th day of March, A. D. 1925.

' AARON FRANKENHEIM. 

